Contact VS Non Contact

• What are vector quantities?

  Quantities with both size and direction e.g. velocity, displacement, acceleration
• What are scalar quantities?

  Quantities with only size e.g. speed, distance, time
• What is a contact force?

  When objects are touching and exert a force
• What is a non contact force?

  When objects do not need to touch to exert a force
• What is the relationship between weight and mass?

  Directly proportional

  Weight = Mass * Gravitational Field Strength